Sound producing apparatus and mounting therefor



Feb. 16, 1937. A. M. SKUDRE SOUND PRODUCING APPARATUS AND MOUNTINGTHEREFOR Filed Feb. 26, 1935 INVENTOR.

ARNOLD M.SKUDRE ATTORNEY.

' "Patented'Feb. is, 1937 ATEN l FECE SOUND PRODUCING APPARATUS ANDMOUNTING THEREFOR Arnold M. Skudre, San Francisco, Calif., assignor toSubmarine Signal Company, Boston, Mass.,

a corporation of Maine Application February 26, 1935, Serial No. 8,335

3 Claims.

sels in which there is difficulty of cutting anopening in a vessel. Thisapplies perhaps more especially to wooden ships and to apparatus that isused in depth sounding where a beam of highfrequency compressional wavesis produced.

Particularly in wooden vessels it is very difficult to cut an opening intheves'sel and insert a submarine sound projector or an oscillator andseal the device in such a manner that it is watertight. While it ispossible to accomplish this, nevertheless great precautions must betaken and the expense of installation is very high. In addition, itfrequently happens that the installation will not remain watertight evenif special precautions are taken. This may perhaps be due to the use ofdifferent materials with different elastic properties in thesound-producing apparatus and in the vessel, and it is also due no doubtto the shape and size of the apparatus that is installed.

In'the present invention the installation is a so-called keel-mountingtype but is attached in r such a manner to the vessel that the onlyopentageously received from a downward direction.

The oscillator is also preferably arranged lengthwise or longitudinallywith the keel so that the beam will spread perpendicular to the keel orin the directionof the roll of the vessel.

The invention will be more fully described in connection with thedrawing in which Fig. 1 shows a section through the lower part of thekeel where the oscillator is placed; Fig. 2 shows a side view movingfrom the left of Fig. 1; Fig. 3 shows a modification of a detail shownin Fig. 2; Fig. 4 shows a sectional view from the end of the keel of themodification shown in Fig. 3; and Fig. 5 shows a broken section on theline 55 of Fig. 1.

In Fig. 1 the wooden hull is represented as I with the keel projectingfrom the bottom as indownward and running longitudinally of the keel.The oscillator is provided with two recessed portions 6 and l in whichare positioned the bolts 8 and 9 which pass through the keel 2 and areheld fast on the other side by means of the nuts l holding the washer llagainst the keel. The recessed portion 1 is filled with cement 30 tocover the bolt heads and complete a flush surface with the outside ofthe oscillator.

The oscillator itself is provided with a frame l2, as indicated in Fig.5, at one end of which there is provided means for conducting the cableto the inner casing l3 in which the energizing mech anism is maintained.This means positioned at the end of the frame comprises two chambers itand IS with a wall partition it between. The

' chamber It has a flange I 1 coming out flush to the side edge of theoscillator frame, and the chamber i is also closed at its external sideby a surface !8 flush with the side of the oscillator and by a coverplate l9 which is threaded into the side walls of the chamber [5.

The conducting cable 20 enters from the chamber it through a stuflingbox 2! into the watertight chamber if: from whence it enters the part ofthe oscillator where the generating mechanism is. The cable 20 entersfrom the top of the oscillator through the opening 22, as indicated moreclearly perhaps in Fig. 1. The cable. is protected by a cover 23 whichmay be nailed to the side of the keel as indicated by the nails 24.

As shown in Figs. 1 and 2 this protecting shield extends upward to theside of the vessel where the cable passes through a hole 25 into theinterior of the vessel, a watertight joint being provided by the stufhngbox 26 at the inside of the vessel. It will be noted from thedescription above that no external cables are provided, and that theentire installation is effected simply by two holes drilled through thekeel itself and. not into the vessel. It is quite obvious that theexpense involved in such an installation is very insignificant and thatit can be accomplished in a. very short time at favorable opportunitiessuch as when the vessel is docked.

In Figs. 3 and 4 there is shown a modification of the installationotherwise shown. The oscillator frame 21 is provided with an upwardlyextending flange 28 contacting with the side surface of the keel. Thisupwardly extending flange furnishes a pressure element for any forcethat may strike the bottom of the oscillator.

It will be noted that in the operation of the device the oscillatorextending longitudinally of the keel and having a surface which is largein its length as compared with the wave length of the frequencyproduced, will produce a beam of compressional waves of a fan type whichwill extend out sidewise of the vessel and will, therefore, direct abeam downward regardless of the roll of the vessel. In this way theoperator may be assured that the impulse transmitted will be received onthe receiver which may, of course,

' the oscillator having an open side facing the keel, means bolting saidoscillator to said keel through said web portion and means providingelectrical connectingelements through said web from said chamber.

2. In combination with a wooden keel of a vessel, a high-frequencycompressional wave oscillator having a casing and a diaphragm formed atone side thereof, said casing being elongated and. having extending atthe end thereof a web element, said web element being normal to thesurface of the diaphragm and said diaphragm being adapted to face in adownward direction, said web element forming with the walls of thecasing a compartment, means providing electrical connections throughsaid compartment and through said web element to the interior of thecasing and bolt means holding said casing to said keel, said bolt meanspassin through said web and said keel.

3. In combination with a wooden keel of a vessel, a high-frequencycompressional wave oscillator having a casing with an elongateddiaphragm positioned on one face of the casing, said casing having aside edge normal to the diaphragm and adapted to fit flush with the keelof the vessel, means provided at each end of said casing for holdingsaid casing to the keel, said means including as a part of the casing aweb element positioned normal to the diaphragm at the ends of the casingand substantially spaced from the side surface adapted to abut the keel,a bolt passing through each web into the keel of the vessel and meanscovering said bolt and forming a continuous surface at the side oppositethe one abutting the keel.

ARNOLD M. SKUDRE.

